mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
synced 2024-11-15 04:35:17 +00:00
113 lines
2.2 KiB
Go
113 lines
2.2 KiB
Go
package udpmux
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import (
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"context"
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"errors"
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"net"
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"time"
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pool "github.com/libp2p/go-buffer-pool"
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)
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type packet struct {
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buf []byte
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addr net.Addr
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}
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var _ net.PacketConn = &muxedConnection{}
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const queueLen = 128
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// muxedConnection provides a net.PacketConn abstraction
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// over packetQueue and adds the ability to store addresses
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// from which this connection (indexed by ufrag) received
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// data.
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type muxedConnection struct {
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ctx context.Context
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cancel context.CancelFunc
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onClose func()
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queue chan packet
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mux *UDPMux
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}
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var _ net.PacketConn = &muxedConnection{}
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func newMuxedConnection(mux *UDPMux, onClose func()) *muxedConnection {
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ctx, cancel := context.WithCancel(mux.ctx)
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return &muxedConnection{
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ctx: ctx,
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cancel: cancel,
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queue: make(chan packet, queueLen),
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onClose: onClose,
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mux: mux,
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}
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}
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func (c *muxedConnection) Push(buf []byte, addr net.Addr) error {
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select {
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case <-c.ctx.Done():
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return errors.New("closed")
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default:
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}
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select {
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case c.queue <- packet{buf: buf, addr: addr}:
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return nil
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default:
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return errors.New("queue full")
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}
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}
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func (c *muxedConnection) ReadFrom(buf []byte) (int, net.Addr, error) {
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select {
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case p := <-c.queue:
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n := copy(buf, p.buf) // This might discard parts of the packet, if p is too short
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if n < len(p.buf) {
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log.Debugf("short read, had %d, read %d", len(p.buf), n)
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}
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pool.Put(p.buf)
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return n, p.addr, nil
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case <-c.ctx.Done():
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return 0, nil, c.ctx.Err()
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}
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}
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func (c *muxedConnection) WriteTo(p []byte, addr net.Addr) (n int, err error) {
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return c.mux.writeTo(p, addr)
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}
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func (c *muxedConnection) Close() error {
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select {
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case <-c.ctx.Done():
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return nil
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default:
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}
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c.onClose()
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c.cancel()
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// drain the packet queue
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for {
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select {
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case p := <-c.queue:
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pool.Put(p.buf)
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default:
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return nil
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}
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}
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}
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func (c *muxedConnection) LocalAddr() net.Addr { return c.mux.socket.LocalAddr() }
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func (*muxedConnection) SetDeadline(t time.Time) error {
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// no deadline is desired here
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return nil
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}
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func (*muxedConnection) SetReadDeadline(t time.Time) error {
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// no read deadline is desired here
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return nil
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}
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func (*muxedConnection) SetWriteDeadline(t time.Time) error {
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// no write deadline is desired here
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return nil
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}
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